Two more national restaurant chains have joined the list of eating establishments asking customers to leave their guns at home.

Sonic Drive-In and Chili's Grill & Bar both issued statements last week telling customers not to openly carry firearms in their restaurants, according to Fox News.

Chili's Dallas-based parent company issued this statement on Friday:

"We recognize that the open carry of firearms in restaurants creates an uncomfortable atmosphere and is not permitted under many local liquor laws. So, we kindly ask that guests refrain from openly carrying firearms into our restaurants and we will continue to follow state and local laws on this issue."

Sonic also issued a statement Friday, which said:

"We've considered the views and desires of our customers and employees that staff the drive-ins across the country. Accordingly, we're asking that customers refrain from bringing guns onto our patios or into our indoor dining areas. With respect to the storage of guns in vehicles, we ask that our customers continue to honor local laws."

Demonstrators with Open Carry Texas, an open-carry handgun advocacy group, entered the restaurant carrying firearms. Employees, fearing they were going to be robbed, locked themselves in the restaurant's freezer.

Police hadn't been informed of the demonstrations, and responded to the call as though a robbery were taking place.

Demonstrations by the group have also taken place at Sonic, Chili's and Chipotle Mexican Grill locations in Texas, according to USA Today.

Chipotle took action first. In May, the chain issued a statement implementing a no-gun policy, saying, "the display of firearms in our restaurants has now created an environment that is potentially intimidating or uncomfortable for many of our customers."

"Moms thank Sonic and Brinker International, which includes Chili's Grill & Bar, for taking action to stand up for the safety and security of our families. We are heartened that we can take our children to these family-oriented restaurants and not worry about being confronted by customers with semiautomatic rifles."

Starbucks, Wendy's, Jack In The Box, and Applebee's restaurants have also asked customers to leave guns at home, according to Fox News.